<!DOCTYPE html>
<html lang="en" xmlns:v-on="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--
    Vue基本语法：
    v-on:事件="方法名"
-->
<div id="app">
    <button v-on:click="sayHi">Click Me</button>
</div>

<!--导入vue.js cdn-->
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.min.js"></script>
<script>
   var vm = new Vue({
       el: "#app",
       data: {
           msg: "狂射说Java"
       },
       methods:{//Vue的方法区
            sayHi: function () {
                alert(this.msg);
            }
       }
   });
</script>

</body>
</html>